L8051XC1: Legacy-Configurable 8051-Compatible Microcontroller IP Core - The L8051XC1 is an MCS®51-compatible microcontroller core designed to match the timing and peripherals of legacy 8051-based systems. It supports instruction execution every 12, 6, or 4 clock cycles… CAST develops, sells, and supports digital Silicon IP Cores which electronic system designers use to shorten development time and lower production risk. CAST uniquely gives system designers the CAST… Arria® V GT FPGA Arria® V GX FPGA Arria® V GZ FPGA Arria® V ST SoC FPGA Arria® V SX SoC FPGA Cyclone® IV E FPGA Cyclone® IV GX FPGA Cyclone® V E FPGA Cyclone® V GT FPGA Cyclone® V GX FPGA Cyclone® V SE SoC FPGA Cyclone® V ST SoC FPGA Cyclone® V SX SoC FPGA Intel Agilex® 3 FPGAs and SoC FPGAs C-Series Intel Agilex® 5 FPGAs and SoC FPGAs D-Series Intel Agilex® 5 FPGAs and SoC FPGAs E-Series Intel Agilex® 7 FPGAs and SoC FPGAs F-Series Intel Agilex® 7 FPGAs and SoC FPGAs I-Series Intel Agilex® 7 FPGAs and SoC FPGAs M-Series Intel Agilex® 9 FPGAs and SoC FPGAs Direct RF-Series Intel® Arria® 10 GT FPGA Intel® Arria® 10 GX FPGA Intel® Arria® 10 SX SoC FPGA Intel® Cyclone® 10 GX FPGA Intel® Cyclone® 10 LP FPGA Intel® MAX® 10 FPGA Intel® Stratix® 10 AX SoC FPGA Intel® Stratix® 10 DX FPGA Intel® Stratix® 10 GX FPGA Intel® Stratix® 10 SX SoC FPGA Intel® Stratix® 10 TX FPGA Stratix® III FPGA Stratix® IV E FPGA Stratix® IV GX FPGA Stratix® V GS FPGA Stratix® V GX FPGA The L8051XC1 core implements an MCS®51-compatible microcontroller that is specially designed to match the timing and peripherals of legacy 8051 MCU-based systems. The core can be configured to execute an instruction every 12, 6, or 4 clock cycles. Architectural extensions are user-selectable, including multiple data-pointers, a multiply-division unit, and a power management unit. Furthermore, the 8051 CPU can be coupled with a wide range of peripherals matching the behavior and timing of peripherals found in legacy architectures from Intel, Philips/NXP, Siemens/Infineon, Maxim/Dallas, Texas Instruments and others. Several pre-configured versions are offered; custom variations are also available. The L8051XC1 runs legacy code, but new software development is facilitated through CAST’s on-chip debugging option, and de-bug pods that cooperate with IAR Embedded Workbench & Keil uVision™ IDEs. This product builds on CAST’s experience with hundreds of 8051 IP customers going back to 1997. Designed for easy reuse in ASICs or FPGAs, the core is strictly synchronous, with positive-edge clocking (except in the optional debug & SPI modules), synchronous reset, and no internal tri-states. Representative 65nm ASIC results show the core to be conservative in its use of space, requiring just 7,900 to 20,000 gates. Access Consumer Defense Industrial Test L8051XC1: Legacy-Configurable 8051-Compatible Microcontroller IP Core Key Features Fully compatible with the MCS® 51 instruction set, enabling seamless execution of legacy software. Offering Brief Yes Yes No Yes Encrypted Verilog Encrypted VHDL Verilog VHDL Arria® V GT FPGA Arria® V GX FPGA Arria® V GZ FPGA Arria® V ST SoC FPGA Arria® V SX SoC FPGA Cyclone® IV E FPGA Cyclone® IV GX FPGA Cyclone® V E FPGA Cyclone® V GT FPGA Cyclone® V GX FPGA Cyclone® V SE SoC FPGA Cyclone® V ST SoC FPGA Cyclone® V SX SoC FPGA Intel Agilex® 3 FPGAs and SoC FPGAs C-Series Intel Agilex® 5 FPGAs and SoC FPGAs D-Series Intel Agilex® 5 FPGAs and SoC FPGAs E-Series Intel Agilex® 7 FPGAs and SoC FPGAs F-Series Intel Agilex® 7 FPGAs and SoC FPGAs I-Series Intel Agilex® 7 FPGAs and SoC FPGAs M-Series Intel Agilex® 9 FPGAs and SoC FPGAs Direct RF-Series Intel® Arria® 10 GT FPGA Intel® Arria® 10 GX FPGA Intel® Arria® 10 SX SoC FPGA Intel® Cyclone® 10 GX FPGA Intel® Cyclone® 10 LP FPGA Intel® MAX® 10 FPGA Intel® Stratix® 10 AX SoC FPGA Intel® Stratix® 10 DX FPGA Intel® Stratix® 10 GX FPGA Intel® Stratix® 10 SX SoC FPGA Intel® Stratix® 10 TX FPGA Stratix® III FPGA Stratix® IV E FPGA Stratix® IV GX FPGA Stratix® V GS FPGA Stratix® V GX FPGA Yes Yes 24.3.1 Offering Brief Production a1JUi0000049U6ZMAU What's Included Verilog/System Verilog, VHDL, Encrypted Verilog/System Verilog, Encrypted VHDL, r FPGA netlist Ordering Information L8051XC1 a1JUi0000049U6ZMAU Production Intellectual Property (IP) a1MUi00000BO8rRMAT a1MUi00000BO8rRMAT Member 2025-10-31T20:56:51.000+0000 The L8051XC1 is an MCS®51-compatible microcontroller core designed to match the timing and peripherals of legacy 8051-based systems. It supports instruction execution every 12, 6, or 4 clock cycles and includes user-selectable architectural extensions such as multiple data pointers, a multiply/divide unit, and a power management unit. The core can be coupled with peripherals that match the behavior of those from legacy vendors like Intel, NXP, Infineon, Maxim, and TI. Several pre-configured versions are available, along with options for customization. It supports legacy code and modern development through CAST’s on-chip debugging features and compatibility with IAR Embedded Workbench and Keil uVision™ IDEs. With design experience dating back to 1997 and hundreds of 8051 IP customers, CAST ensures that the core is optimized for easy ASIC/FPGA reuse. It is strictly synchronous, with positive-edge clocking and no internal tri-states. At 65nm, the core uses just 7.9K–20K gates. Partner Solutions